US20100181116A1 - Impregnated drill bit with diamond pins - Google Patents
Impregnated drill bit with diamond pins Download PDFInfo
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- US20100181116A1 US20100181116A1 US12/355,258 US35525809A US2010181116A1 US 20100181116 A1 US20100181116 A1 US 20100181116A1 US 35525809 A US35525809 A US 35525809A US 2010181116 A1 US2010181116 A1 US 2010181116A1
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- 239000010432 diamond Substances 0.000 title claims abstract description 49
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 47
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 description 87
- 238000005755 formation reaction Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 11
- 239000012530 fluid Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 230000035515 penetration Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003870 refractory metal Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011156 metal matrix composite Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
Definitions
- the inventions disclosed and taught herein relate generally to drill bits for drilling wells; and more specifically relate to diamond impregnated drill bits with super-abrasive cutting elements for drilling wells in earth formations.
- U.S. Pat. No. 4,190,126 discloses a “rotary abrasive drilling bit disclosed herein is of a construction wherein teeth are equipped on the fore part of a bit body attached to a rotary drill pipe, each of said teeth is composed of a plurality of chips which are made of cemented tungsten carbide and the matrix thereof which is soft and inferior in abrasion resistance relative to said cutting elements or chips, each chip is shaped like a thin stick and extends along the cutting direction of said bit body, the matrix surrounds said chips, and in the matrix of each tooth the chips are orderly arranged to leave a desired interspace along the direction of radius as well as the direction of circumference of the bit body.”
- U.S. Pat. No. 6,095,265 discloses “a diamond impregnated bit with an adaptive matrix in the ribs.
- the ribs have at least two different areas of metal-matrix composite impregnated with diamonds with different wear resistance such that during boring of formation, the areas will wear at different rates and provide fluid flow spaces across the surface of the ribs.”
- U.S. Pat. No. 6,296,069 discloses a “drill bit as used in particular in the oil well drilling field comprising a central body (2), cutting blades (3) protruding with respect to the body (2), both at the front of this body according to a drill direction and at the sides of this same body (2), and cutting elements (9) divided over an outer front surface (10) and over an outer lateral well sizing surface (11) comprised by each blade (3), wherein there are provided as cutting elements: in a central area (13) of the front surface (10), on at least one blade (3): at least one synthetic polycrystalline diamond compact cutting disc (12), and in a remaining area (14) of the front surface (10) of this blade, situated beyond said central area (13) with respect to the rotation axis, and on the other blades: thermally stable synthetic diamonds and/or impregnated diamond particles.”
- U.S. Pat. No. 6,510,906 discloses a “drill bit employing a plurality of discrete, post-like diamond grit impregnated cutting structures extending upwardly from abrasive particulate-impregnated blades defining a plurality of fluid passages therebetween on the bit face.
- PDC cutters with faces oriented in the general direction of bit rotation are placed in the cone of the bit, which is relatively shallow, to promote enhanced drilling efficiency through softer, non-abrasive formations.
- a plurality of ports, configured to receive nozzles therein are employed for improved drilling fluid flow and distribution.
- the blades may extend radially in a linear fashion, or be curved and spiral outwardly to the gage to provide increased blade length and enhanced cutting structure redundancy.”
- U.S. Pat. No. 6,843,333 discloses a “drill bit employing a plurality of discrete, post-like, abrasive, particulate-impregnated cutting structures extending upwardly from abrasive, particulate-impregnated blades defining a plurality of fluid passages therebetween on the bit face. Additional cutting elements may be placed in the cone of the bit surrounding the centerline thereof. The blades may extend radially in a linear fashion, or be curved and spiral outwardly to the gage to provide increased blade length and enhanced cutting structure redundancy. Additionally, discrete protrusions may extend outwardly from at least some of the plurality of cutting structures. The discrete protrusions may be formed of a thermally stable diamond product and may exhibit a generally triangular cross-sectional geometry relative to the direction of intended bit rotation.”
- U.S. Pat. No. 7,234,550 discloses an “insert for a drill bit which includes a diamond impregnated body, and a shearing portion disposed on said body is shown.
- a method for forming a drill bit that includes (a) forming a shearing portion on a diamond-impregnated insert body to form a cutting insert, (b) forming a bit body having a plurality of sockets sized to receive a plurality of the cutting inserts, and (c) mounting the plurality of cutting inserts in the bit body and affixing the plurality of cutting inserts to the bit body; wherein steps (a) (c) are carried out such that a total exposure of the diamond-impregnated insert to temperatures above 1000° F. is greater than a total exposure of the shearing portion to temperatures above 1000° F.”
- European Patent No. 0391683 teaches “a rotatable crown for a rotary drill”.
- inventions disclosed and taught herein are directed to an improved diamond impregnated drill bit with super-abrasive cutting elements for drilling wells in earth formations.
- the drill bit comprises a diamond impregnated bit body with one or more thermally stable pins embedded therein.
- the drill bit may include a diamond impregnated bit body having a plurality of blades, with one or more of the blades having a cone section, a nose section, a shoulder section, and a gage section; a plurality of diamond impregnated cutters extending from the blades; and one or more thermally stable polycrystalline diamond pins embedded within, and possibly extending from, at least some of the cutters.
- each cutter includes an embedded pin.
- the pin or pins may be located in the cone, shoulder, nose, and/or gauge sections.
- FIG. 1 comprises an inverted perspective view of a first embodiment of a bit of the present invention
- FIG. 2 is a top elevation of the bit of FIG. 1 after testing, showing wear of discrete cutting structures and PDC cutters;
- FIG. 3 is an enlarged perspective view of an exemplary cutting structure embodying certain aspects of the present inventions
- FIG. 4 is an enlarged perspective view of another exemplary cutting structure embodying certain aspects of the present inventions.
- FIG. 5 is a partial cut-away view of a mold embodying certain aspects of the present inventions.
- FIG. 6 is another partial cut-away view of a mold embodying certain aspects of the present inventions.
- the drill bit comprises a diamond impregnated bit body with one or more thermally stable pins embedded therein.
- the drill bit may include a diamond impregnated bit body having a plurality of blades, with one or more of the blades having a cone section, a nose section, a shoulder section, and a gage section; a plurality of diamond impregnated cutters extending from the blades; and one or more thermally stable polycrystalline diamond pins embedded within, and possibly extending from, at least some of the cutters.
- each cutter includes an embedded pin.
- the pin or pins may be located in the cone, shoulder, nose, and/or gauge sections.
- the present invention includes both a method manufacturing a drill bit and several embodiments of a drill bit 10 for drilling a well in an earth formation.
- the bit 10 may be similar to those disclosed in U.S. Pat. No. 6,843,333, the disclosure of which is incorporated herein by specific reference in its entirety.
- FIGS. 1 and 2 a first embodiment of the bit 10 of the present invention is depicted.
- the bit 10 is shown inverted from its normal face-down operating orientation for clarity.
- the bit 10 is, in one embodiment, 81 ⁇ 2′′ in diameter and includes a matrix-type bit body 12 having a shank 14 for connection to a drill string (not shown) extending therefrom opposite a bit face 16 .
- a plurality of blades 18 extends generally radially outwardly in linear fashion to gage pads 20 defining junk slots 22 therebetween.
- the bit 10 may include a plurality of discrete cutters.
- the cutters include impregnated cutting structures 24 comprising posts extending upwardly from the blades 18 on the bit face 16 .
- the cutting structures 24 may be formed as an integral part of the matrix-type blades 18 projecting from the matrix-type bit body 12 by hand-packing diamond grit-impregnated matrix material in mold cavities on the interior of a bit mold defining locations of the cutting structures 24 and blades 18 .
- each blade 18 and associated cutting structure 24 may define a unitary structure.
- the cutting structures 24 may be placed directly on the bit face 16 , dispensing with the blades.
- the cutting structures 24 may be formed as discrete individual segments, such as by hot isostatic pressing, and subsequently brazed or furnaced onto the bit 10 .
- the discrete cutting structures 24 may be mutually separate from each other to promote drilling fluid flow therearound for enhanced cooling and clearing of formation material removed by the diamond grit.
- the discrete cutting structures 24 may be generally of a round or circular transverse cross-section at their substantially flat, outermost ends, but become more oval with decreasing distance from the face of the blades 18 and thus provide wider or more elongated (in the direction of bit rotation) bases for greater strength and durability.
- the exposed cross-section of the posts increases, providing progressively increasing contact area for the diamond grit with the formation material.
- the bit 10 takes on the configuration of a heavier-set bit more adept at penetrating harder, more abrasive formations. Even if discrete cutting structures 24 wear completely away, the diamond-impregnated blades 18 will provide some cutting action, reducing any possibility of ring-out and having to pull the bit 10 .
- the cutting structures 24 are illustrated as exhibiting posts of circular outer ends and oval shaped bases, other geometries are also contemplated.
- the outermost ends of the cutting structures may be configured as ovals having a major diameter and a minor diameter.
- the base portion adjacent the blade 18 might also be oval, having a major and a minor diameter, wherein the base has a larger minor diameter than the outermost end of the cutting structure 24 .
- the minor diameter increases, resulting in a larger surface area.
- the ends of the cutting structures 24 need not be flat, but may employ sloped geometries. In other words, the cutting structures 24 may change cross-sections at multiple intervals, and tip geometry may be separate from the general cross-section of the cutting structure.
- cutting structures 24 may be varied to change the overall aggressiveness of the bit 10 or to change the rate at which the bit is transformed from a light-set bit to a heavy-set bit during operation. It is further contemplated that one or more of such cutting structures 24 may be formed to have substantially constant cross-sections if so desired depending on the anticipated application of the bit 10 .
- the discrete cutting structures 24 , blades 18 , and/or bit body 12 may comprise a synthetic diamond grit, such as, for example, DSN-47 Synthetic diamond grit, commercially available from DeBeers of Shannon, Ireland, which has demonstrated toughness superior to natural diamond grit.
- the tungsten carbide matrix material with which the diamond grit is mixed to form discrete cutting structures 24 and supporting blades 18 may desirably include a fine grain carbide, such as, for example, DM2001 powder commercially available from Kennametal Inc., of Latrobe, Pa. Such a carbide powder, when infiltrated, provides increased exposure of the diamond grit particles in comparison to conventional matrix materials due to its relatively soft, abradable nature.
- each blade 18 may desirably be formed of, for example, a more durable 121 matrix material, obtained from Firth MPD of Houston, Tex. Use of the more durable material in this region helps to prevent ring-out even if all of the discrete cutting structures 24 are abraded away and the majority of each blade 18 is worn.
- the discrete cutting structures 24 may include natural diamond grit, or a combination of synthetic and natural diamond grit.
- the cutting structures may include synthetic diamond pins 28 .
- the particulate abrasive material may be coated with a single layer or multiple layers of a refractory material, as known in the art and disclosed in U.S. Pat. Nos. 4,943,488 and 5,049,164, the disclosures of each of which are hereby incorporated herein by reference in their entirety.
- Such refractory materials may include, for example, a refractory metal, a refractory metal carbide or a refractory metal oxide.
- the coating may exhibit a thickness of approximately 1 to 10 microns. In another embodiment, the coating may exhibit a thickness of approximately 2 to 6 microns. In yet another embodiment, the coating may exhibit a thickness of less than 1 micron.
- one or more of the blades 18 may carry cutters in the form of polycrystalline diamond compact (PDC) cutting elements 26 , in conventional orientations, with cutting faces oriented generally facing the direction of bit rotation.
- the PDC cutting elements 26 are located within the cone portion 34 of the bit face 16 .
- the cone portion 34 is the portion of the bit face 16 wherein the profile is defined as a generally cone-shaped section about the centerline of intended rotation of the drill bit 10 .
- the PDC cutting elements 26 may be located across the blades 18 and elsewhere on the bit 10 .
- the PDC cutting elements 26 may comprise cutters having a PDC jacket or sheath extending contiguously with, and to the rear of, the PDC cutting face and over a supporting substrate.
- a cutter of this type is offered by Hughes Christensen Company, a wholly owned subsidiary of the assignee of the present invention, as NIAGARATM cutters. Such cutters are further described in U.S. Pat. No. 6,401,844, the disclosure of which is incorporated herein by specific reference in its entirety.
- This cutter design provides enhanced abrasion resistance to the hard and/or abrasive formations typically drilled by impregnated bits, in combination with enhanced performance, or rate of penetration (ROP), in softer, nonabrasive formation layers interbedded with such hard formations.
- ROP rate of penetration
- the PDC cutting elements 26 may be configured of various shapes, sizes, or materials as known by those of skill in the art.
- other types of cutting elements may be formed within the cone portion 34 of, and elsewhere across, the bit 10 depending on the anticipated application of the bit 10 .
- the cutting elements 26 may include cutters formed of thermally stable polycrystalline diamond product (TSP), natural diamond material, or impregnated diamond.
- PDC cutting elements such as those discussed above
- other cutters may be used alternatively and/or additionally.
- cutters made of thermally stable polycrystalline (TSP) diamond, in triangular, pin, and/or circular configuration, cubic boron nitride (CBN), and/or other superabrasive materials may be used.
- TSP thermally stable polycrystalline
- CBN cubic boron nitride
- even simple carbide cutters may be used.
- An exemplary cutting structure 24 of the present invention includes a TSP pin 28 of circular, rectangular or other polygon, oval, truncated circular, triangular, or other suitable cross-section.
- the TSP pin 28 exhibiting a circular cross-section and an overall cylindrical configuration, or shape, is suitable for a wide variety of drill bits and drilling applications.
- the TSP pins 28 are preferably embedded within the cutting structures 24 .
- the TSP pins 28 may extend from the cutting structures 24 . Additionally, or alternatively, the pins 28 may be embedded within, and may extend from, the blades 18 and/or bit body 12 themselves, with or without the cutters and/or blades 18 .
- the TSP pins 28 may extend from and/or through the cutters, blades 18 , and/or bit body 12 . As a result, as the TSP pins 28 retard wear of the cutters, blades 18 , and/or bit body 12 . Furthermore, the TSP pins 28 may stand out from the cutters, blades 18 , and/or bit body 12 , thereby giving higher point loading, before and/or after wear of the cutters, blades 18 , and/or bit body 12 . In any case, the TSP pins 28 may make the cutters, blades 18 , and/or bit body 12 more aggressive, thereby increasing ROP and/or decreasing the specific energy required.
- the drill bit 10 may be manufactured using a prepared mold 50 .
- the mold 50 preferably has a bit body cavity 52 and may have one or more blade cavities 54 .
- the mold 50 may also have a plurality of cutter cavities 56 extending from the blade cavities 54 and/or bit body cavity 52 , in cases where the cutters are to be integrally formed with the bit body 12 and/or blades 18 .
- the mold 50 may only include one or more cutter cavities 56 .
- the mold 50 may include a plurality of cutter cavities 56 extending from one or more blade cavities 54 .
- the mold 50 may include one or more pin cavities 58 .
- the pins 28 are placed therein. Then, a matrix material, such as a tungsten carbide matrix and/or a diamond grit-impregnated matrix material is packed into the mold 50 . Finally, a binder material, such as liquefied copper, is allowed to flow into the mold, thereby forming the cutters, blades 18 , and/or bit body 12 .
- a matrix material such as a tungsten carbide matrix and/or a diamond grit-impregnated matrix material is packed into the mold 50 .
- a binder material such as liquefied copper, is allowed to flow into the mold, thereby forming the cutters, blades 18 , and/or bit body 12 .
- the bit 10 may be designed to have more cutters and/or pins 28 in heavy, or high, wear areas.
- the bit 10 may also be designed such that the cutters and/or pins 28 exhibit an optimum bottom hole pattern for increasing ROP in one or more of types of formations.
- each blade 18 preferably has a cone section, a nose section, a shoulder section, and a gage section.
- the cone section of each blade is preferably a substantially linear section extending from near a center-line of the drill bit 10 outward. Because the cone section is nearest the center-line of the drill bit 10 , the cone section does not experience as much, or as fast, movement relative to the earth formation. Therefore, it has been discovered that the cone section commonly experiences less wear than the other sections. Thus, the cone section can maintain effective and efficient rate of penetration with less cutting material. This can be accomplished in a number of ways.
- the cone section may have no or fewer cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 , smaller cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 , and/or more spacing between cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 .
- the cone angle for a PDC bit is typically 15-25°, although, in some embodiments, the cone section is essentially flat, with a substantially 0° cone angle.
- the nose represents the lowest point on a drill bit. Therefore, the nose cutter is typically the leading most cutter.
- the nose section is roughly defined by a nose radius. A larger nose radius provides more area to place cutters in the nose section.
- the nose section begins where the cone section ends, where the curvature of the blade begins, and extends to the shoulder section. More specifically, the nose section extends where the blade profile substantially matches a circle formed by the nose radius.
- the nose section experiences much more, and more rapid, relative movement than does the cone section. Additionally, the nose section typically takes more weight than the other sections. As such, the nose section commonly experiences much more wear than does the cone section. Therefore, the nose section preferably has a higher distribution, concentration, or density of cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 with respect to the cone section.
- the shoulder section begins where the blade profile departs from the nose radius and continues outwardly on each blade 18 to a point where a slope of the blade is essentially completely vertical, at the gage section.
- the shoulder section experiences much more, and more rapid, relative movement than does the cone section.
- the shoulder section typically takes the brunt of abuse from dynamic dysfunction, such as bit whirl. As such, the shoulder section experiences much more wear than does the cone section.
- the shoulder section is also a more significant contributor to rate of penetration and drilling efficiency than the cone section. Therefore, the shoulder section preferably has a higher distribution, concentration, or density of cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 with respect to the cone section.
- the nose section or the shoulder section may experience the most wear, and therefore either the nose section or the shoulder section may have the highest distribution, concentration, or density of cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 .
- the gage section begins where the shoulder section ends. More specifically, the gage section begins where the slope of the blade is predominantly vertical. The gage section continues outwardly to an outer perimeter or gauge of the drill bit 10 . The gage section experiences the most, and most rapid, relative movement with respect to the earth formation. However, at least partially because of the high, substantially vertical, slope of the blade 18 in the gage section, the gage section does not typically experience as much wear as does the shoulder section and/or the nose section. The gage section does, however, typically experience more wear than the cone section.
- the gage section preferably has a higher distribution of cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 than the cone section, but may have a lower distribution of cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 than the shoulder section and/or nose section.
- a highest concentration of the cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 occurs near the border between the shoulder section and the gage section.
- Alternative embodiments may include a highest concentration of the cutters, cutting structures 24 , PDC cutting elements 26 , and/or TSP pins 28 , in the shoulder section and/or the gage section.
- the design of a drill bit includes consideration of many factors, such as the size, shape, spacing, orientation, and number of blades; the size, shape, spacing, orientation, and number of cutters, or cutting elements; as well as the materials of the bit body, blades, cutting tables, and substrates. All of these factors may be considered in light of the materials of the earth formation(s) for which the drill bit is designed and/or matched.
- the bit 10 may employ a plurality of ports 36 over the bit face 16 to enhance fluid velocity of drilling fluid flow and better apportion the flow over the bit face 16 and among fluid passages 38 between blades 18 and extending to junk slots 22 .
- This enhanced fluid velocity and apportionment helps prevent bit balling in shale formations, for example, which phenomenon is known to significantly retard rate of penetration (ROP).
- ROP rate of penetration
- the improved hydraulics substantially enhances drilling through permeable sandstones.
- the TSP pins 28 may be embedded within the PDC cutting elements 26 as well.
- the cutters such as the impregnated cutting structures 24 and/or PDC cutting elements 26 , with or without the TSP pins 28 , may be formed separately from the bit body 12 , and later secured thereto, such as by brazing.
- the TSP pins 28 may be secured to, or within, previously formed cutters, blades 18 , and/or the bit body 12 .
- one, two, three, or more TSP pins 28 may be embedded within any one or more of the cutters.
Abstract
A method of manufacturing a drill bit and several embodiments of a drill bit for drilling a well in an earth formation. In one embodiment, the drill bit comprises a diamond impregnated bit body with one or more thermally stable pins embedded therein. More specifically, the drill bit may include a diamond impregnated bit body having a plurality of blades, with one or more of the blades having a cone section, a nose section, a shoulder section, and a gage section; a plurality of diamond impregnated cutters extending from the blades; and one or more thermally stable polycrystalline diamond pins embedded within, and possibly extending from, at least some of the cutters. In some embodiments, each cutter includes an embedded pin. Alternatively, the pin or pins may be located in the cone, shoulder, nose, and/or gauge sections.
Description
- This subject matter of this application is similar to the subject matter disclosed in U.S. patent application Ser. Nos. 12/250,443, 12/250,445, 12/250,447, and 12/250,448, all filed Oct. 13, 2008, and U.S. patent application Ser. No. 12/274,709, filed Nov. 20, 2008. The above mentioned patent applications are incorporated herein by specific reference.
- Not applicable.
- Not applicable.
- 1. Field of the Invention
- The inventions disclosed and taught herein relate generally to drill bits for drilling wells; and more specifically relate to diamond impregnated drill bits with super-abrasive cutting elements for drilling wells in earth formations.
- 2. Description of the Related Art
- U.S. Pat. No. 4,190,126 discloses a “rotary abrasive drilling bit disclosed herein is of a construction wherein teeth are equipped on the fore part of a bit body attached to a rotary drill pipe, each of said teeth is composed of a plurality of chips which are made of cemented tungsten carbide and the matrix thereof which is soft and inferior in abrasion resistance relative to said cutting elements or chips, each chip is shaped like a thin stick and extends along the cutting direction of said bit body, the matrix surrounds said chips, and in the matrix of each tooth the chips are orderly arranged to leave a desired interspace along the direction of radius as well as the direction of circumference of the bit body.”
- U.S. Pat. No. 6,095,265 discloses “a diamond impregnated bit with an adaptive matrix in the ribs. The ribs have at least two different areas of metal-matrix composite impregnated with diamonds with different wear resistance such that during boring of formation, the areas will wear at different rates and provide fluid flow spaces across the surface of the ribs.”
- U.S. Pat. No. 6,296,069 discloses a “drill bit as used in particular in the oil well drilling field comprising a central body (2), cutting blades (3) protruding with respect to the body (2), both at the front of this body according to a drill direction and at the sides of this same body (2), and cutting elements (9) divided over an outer front surface (10) and over an outer lateral well sizing surface (11) comprised by each blade (3), wherein there are provided as cutting elements: in a central area (13) of the front surface (10), on at least one blade (3): at least one synthetic polycrystalline diamond compact cutting disc (12), and in a remaining area (14) of the front surface (10) of this blade, situated beyond said central area (13) with respect to the rotation axis, and on the other blades: thermally stable synthetic diamonds and/or impregnated diamond particles.”
- U.S. Pat. No. 6,510,906 discloses a “drill bit employing a plurality of discrete, post-like diamond grit impregnated cutting structures extending upwardly from abrasive particulate-impregnated blades defining a plurality of fluid passages therebetween on the bit face. PDC cutters with faces oriented in the general direction of bit rotation are placed in the cone of the bit, which is relatively shallow, to promote enhanced drilling efficiency through softer, non-abrasive formations. A plurality of ports, configured to receive nozzles therein are employed for improved drilling fluid flow and distribution. The blades may extend radially in a linear fashion, or be curved and spiral outwardly to the gage to provide increased blade length and enhanced cutting structure redundancy.”
- U.S. Pat. No. 6,843,333 discloses a “drill bit employing a plurality of discrete, post-like, abrasive, particulate-impregnated cutting structures extending upwardly from abrasive, particulate-impregnated blades defining a plurality of fluid passages therebetween on the bit face. Additional cutting elements may be placed in the cone of the bit surrounding the centerline thereof. The blades may extend radially in a linear fashion, or be curved and spiral outwardly to the gage to provide increased blade length and enhanced cutting structure redundancy. Additionally, discrete protrusions may extend outwardly from at least some of the plurality of cutting structures. The discrete protrusions may be formed of a thermally stable diamond product and may exhibit a generally triangular cross-sectional geometry relative to the direction of intended bit rotation.”
- U.S. Pat. No. 7,234,550 discloses an “insert for a drill bit which includes a diamond impregnated body, and a shearing portion disposed on said body is shown. In addition, a method for forming a drill bit that includes (a) forming a shearing portion on a diamond-impregnated insert body to form a cutting insert, (b) forming a bit body having a plurality of sockets sized to receive a plurality of the cutting inserts, and (c) mounting the plurality of cutting inserts in the bit body and affixing the plurality of cutting inserts to the bit body; wherein steps (a) (c) are carried out such that a total exposure of the diamond-impregnated insert to temperatures above 1000° F. is greater than a total exposure of the shearing portion to temperatures above 1000° F.”
- Two Industrial Diamond Review (IDR) articles, one dated March 1992, and the other dated June 1993, disclose thermally stable pins (TSPs) in a diamond impregnated core bit.
- European Patent No. 0391683 teaches “a rotatable crown for a rotary drill”.
- The inventions disclosed and taught herein are directed to an improved diamond impregnated drill bit with super-abrasive cutting elements for drilling wells in earth formations.
- The invention relates to a method of manufacturing a drill bit and several embodiments of a drill bit for drilling a well in an earth formation. In one embodiment, the drill bit comprises a diamond impregnated bit body with one or more thermally stable pins embedded therein. More specifically, the drill bit may include a diamond impregnated bit body having a plurality of blades, with one or more of the blades having a cone section, a nose section, a shoulder section, and a gage section; a plurality of diamond impregnated cutters extending from the blades; and one or more thermally stable polycrystalline diamond pins embedded within, and possibly extending from, at least some of the cutters. In some embodiments, each cutter includes an embedded pin. Alternatively, the pin or pins may be located in the cone, shoulder, nose, and/or gauge sections.
-
FIG. 1 comprises an inverted perspective view of a first embodiment of a bit of the present invention; -
FIG. 2 is a top elevation of the bit ofFIG. 1 after testing, showing wear of discrete cutting structures and PDC cutters; -
FIG. 3 is an enlarged perspective view of an exemplary cutting structure embodying certain aspects of the present inventions; -
FIG. 4 is an enlarged perspective view of another exemplary cutting structure embodying certain aspects of the present inventions; -
FIG. 5 is a partial cut-away view of a mold embodying certain aspects of the present inventions; and -
FIG. 6 is another partial cut-away view of a mold embodying certain aspects of the present inventions. - The Figures described above and the written description of specific structures and functions below are not presented to limit the scope of what Applicants have invented or the scope of the appended claims. Rather, the Figures and written description are provided to teach any person skilled in the art to make and use the inventions for which patent protection is sought. Those skilled in the art will appreciate that not all features of a commercial embodiment of the inventions are described or shown for the sake of clarity and understanding. Persons of skill in this art will also appreciate that the development of an actual commercial embodiment incorporating aspects of the present inventions will require numerous implementation-specific decisions to achieve the developer's ultimate goal for the commercial embodiment. Such implementation-specific decisions may include, and likely are not limited to, compliance with system-related, business-related, government-related and other constraints, which may vary by specific implementation, location and from time to time. While a developer's efforts might be complex and time-consuming in an absolute sense, such efforts would be, nevertheless, a routine undertaking for those of skill this art having benefit of this disclosure. It must be understood that the inventions disclosed and taught herein are susceptible to numerous and various modifications and alternative forms. Lastly, the use of a singular term, such as, but not limited to, “a,” is not intended as limiting of the number of items. Also, the use of relational terms, such as, but not limited to, “top,” “bottom,” “left,” “right,” “upper,” “lower,” “down,” “up,” “side,” and the like are used in the written description for clarity in specific reference to the Figures and are not intended to limit the scope of the invention or the appended claims.
- Particular embodiments of the invention may be described below with reference to block diagrams and/or operational illustrations of methods. In some alternate implementations, the functions/actions/structures noted in the figures may occur out of the order noted in the block diagrams and/or operational illustrations. For example, two operations shown as occurring in succession, in fact, may be executed substantially concurrently or the operations may be executed in the reverse order, depending upon the functionality/acts/structure involved.
- Applicants have created both a method of manufacturing a drill bit and several embodiments of a drill bit for drilling a well in an earth formation. In one embodiment, the drill bit comprises a diamond impregnated bit body with one or more thermally stable pins embedded therein. More specifically, the drill bit may include a diamond impregnated bit body having a plurality of blades, with one or more of the blades having a cone section, a nose section, a shoulder section, and a gage section; a plurality of diamond impregnated cutters extending from the blades; and one or more thermally stable polycrystalline diamond pins embedded within, and possibly extending from, at least some of the cutters. In some embodiments, each cutter includes an embedded pin. Alternatively, the pin or pins may be located in the cone, shoulder, nose, and/or gauge sections.
- The present invention includes both a method manufacturing a drill bit and several embodiments of a
drill bit 10 for drilling a well in an earth formation. Thebit 10 may be similar to those disclosed in U.S. Pat. No. 6,843,333, the disclosure of which is incorporated herein by specific reference in its entirety. Referring now toFIGS. 1 and 2 , a first embodiment of thebit 10 of the present invention is depicted. InFIG. 1 , thebit 10 is shown inverted from its normal face-down operating orientation for clarity. Thebit 10 is, in one embodiment, 8½″ in diameter and includes a matrix-type bit body 12 having ashank 14 for connection to a drill string (not shown) extending therefrom opposite abit face 16. A plurality ofblades 18 extends generally radially outwardly in linear fashion togage pads 20 definingjunk slots 22 therebetween. - The
bit 10 may include a plurality of discrete cutters. In one embodiment, the cutters include impregnated cuttingstructures 24 comprising posts extending upwardly from theblades 18 on thebit face 16. The cuttingstructures 24 may be formed as an integral part of the matrix-type blades 18 projecting from the matrix-type bit body 12 by hand-packing diamond grit-impregnated matrix material in mold cavities on the interior of a bit mold defining locations of the cuttingstructures 24 andblades 18. Thus, eachblade 18 and associated cuttingstructure 24 may define a unitary structure. It is noted that the cuttingstructures 24 may be placed directly on thebit face 16, dispensing with the blades. It is also noted that, while discussed in terms of being integrally formed with thebit 10, the cuttingstructures 24 may be formed as discrete individual segments, such as by hot isostatic pressing, and subsequently brazed or furnaced onto thebit 10. - The
discrete cutting structures 24 may be mutually separate from each other to promote drilling fluid flow therearound for enhanced cooling and clearing of formation material removed by the diamond grit. Thediscrete cutting structures 24 may be generally of a round or circular transverse cross-section at their substantially flat, outermost ends, but become more oval with decreasing distance from the face of theblades 18 and thus provide wider or more elongated (in the direction of bit rotation) bases for greater strength and durability. As thediscrete cutting structures 24 wear, the exposed cross-section of the posts increases, providing progressively increasing contact area for the diamond grit with the formation material. As the cutting structures wear down, thebit 10 takes on the configuration of a heavier-set bit more adept at penetrating harder, more abrasive formations. Even ifdiscrete cutting structures 24 wear completely away, the diamond-impregnatedblades 18 will provide some cutting action, reducing any possibility of ring-out and having to pull thebit 10. - While the cutting
structures 24 are illustrated as exhibiting posts of circular outer ends and oval shaped bases, other geometries are also contemplated. For example, the outermost ends of the cutting structures may be configured as ovals having a major diameter and a minor diameter. The base portion adjacent theblade 18 might also be oval, having a major and a minor diameter, wherein the base has a larger minor diameter than the outermost end of the cuttingstructure 24. As the cuttingstructure 24 wears towards theblade 18, the minor diameter increases, resulting in a larger surface area. Furthermore, the ends of the cuttingstructures 24 need not be flat, but may employ sloped geometries. In other words, the cuttingstructures 24 may change cross-sections at multiple intervals, and tip geometry may be separate from the general cross-section of the cutting structure. Other shapes or geometries may be configured similarly. It is also noted that the spacing betweenindividual cutting structures 24, as well as the magnitude of the taper from the outermost ends to theblades 18, may be varied to change the overall aggressiveness of thebit 10 or to change the rate at which the bit is transformed from a light-set bit to a heavy-set bit during operation. It is further contemplated that one or more ofsuch cutting structures 24 may be formed to have substantially constant cross-sections if so desired depending on the anticipated application of thebit 10. - The
discrete cutting structures 24,blades 18, and/orbit body 12 may comprise a synthetic diamond grit, such as, for example, DSN-47 Synthetic diamond grit, commercially available from DeBeers of Shannon, Ireland, which has demonstrated toughness superior to natural diamond grit. The tungsten carbide matrix material with which the diamond grit is mixed to formdiscrete cutting structures 24 and supportingblades 18 may desirably include a fine grain carbide, such as, for example, DM2001 powder commercially available from Kennametal Inc., of Latrobe, Pa. Such a carbide powder, when infiltrated, provides increased exposure of the diamond grit particles in comparison to conventional matrix materials due to its relatively soft, abradable nature. The base 30 of eachblade 18 may desirably be formed of, for example, a more durable 121 matrix material, obtained from Firth MPD of Houston, Tex. Use of the more durable material in this region helps to prevent ring-out even if all of thediscrete cutting structures 24 are abraded away and the majority of eachblade 18 is worn. - It is noted, however, that alternative particulate abrasive materials may be suitably substituted for those discussed above. For example, the
discrete cutting structures 24 may include natural diamond grit, or a combination of synthetic and natural diamond grit. Alternatively, the cutting structures may include synthetic diamond pins 28. Additionally, the particulate abrasive material may be coated with a single layer or multiple layers of a refractory material, as known in the art and disclosed in U.S. Pat. Nos. 4,943,488 and 5,049,164, the disclosures of each of which are hereby incorporated herein by reference in their entirety. Such refractory materials may include, for example, a refractory metal, a refractory metal carbide or a refractory metal oxide. In one embodiment, the coating may exhibit a thickness of approximately 1 to 10 microns. In another embodiment, the coating may exhibit a thickness of approximately 2 to 6 microns. In yet another embodiment, the coating may exhibit a thickness of less than 1 micron. - Alternatively, or additionally, one or more of the
blades 18 may carry cutters in the form of polycrystalline diamond compact (PDC) cuttingelements 26, in conventional orientations, with cutting faces oriented generally facing the direction of bit rotation. In one embodiment, thePDC cutting elements 26 are located within thecone portion 34 of thebit face 16. Thecone portion 34, best viewed with reference toFIG. 1 , is the portion of the bit face 16 wherein the profile is defined as a generally cone-shaped section about the centerline of intended rotation of thedrill bit 10. Alternatively, or additionally, thePDC cutting elements 26 may be located across theblades 18 and elsewhere on thebit 10. - The
PDC cutting elements 26 may comprise cutters having a PDC jacket or sheath extending contiguously with, and to the rear of, the PDC cutting face and over a supporting substrate. For example, a cutter of this type is offered by Hughes Christensen Company, a wholly owned subsidiary of the assignee of the present invention, as NIAGARA™ cutters. Such cutters are further described in U.S. Pat. No. 6,401,844, the disclosure of which is incorporated herein by specific reference in its entirety. This cutter design provides enhanced abrasion resistance to the hard and/or abrasive formations typically drilled by impregnated bits, in combination with enhanced performance, or rate of penetration (ROP), in softer, nonabrasive formation layers interbedded with such hard formations. It is noted, however, that alternative PDC cutter designs may be implemented. For example, thePDC cutting elements 26 may be configured of various shapes, sizes, or materials as known by those of skill in the art. Also, other types of cutting elements may be formed within thecone portion 34 of, and elsewhere across, thebit 10 depending on the anticipated application of thebit 10. For example, the cuttingelements 26 may include cutters formed of thermally stable polycrystalline diamond product (TSP), natural diamond material, or impregnated diamond. - While PDC cutting elements, such as those discussed above, are used in one embodiment, other cutters may be used alternatively and/or additionally. For example, cutters made of thermally stable polycrystalline (TSP) diamond, in triangular, pin, and/or circular configuration, cubic boron nitride (CBN), and/or other superabrasive materials may be used. In some embodiments, even simple carbide cutters may be used.
- An
exemplary cutting structure 24 of the present invention, as shown inFIG. 3 andFIG. 4 , includes aTSP pin 28 of circular, rectangular or other polygon, oval, truncated circular, triangular, or other suitable cross-section. TheTSP pin 28, exhibiting a circular cross-section and an overall cylindrical configuration, or shape, is suitable for a wide variety of drill bits and drilling applications. The TSP pins 28 are preferably embedded within the cuttingstructures 24. The TSP pins 28 may extend from the cuttingstructures 24. Additionally, or alternatively, thepins 28 may be embedded within, and may extend from, theblades 18 and/orbit body 12 themselves, with or without the cutters and/orblades 18. Thus, the TSP pins 28 may extend from and/or through the cutters,blades 18, and/orbit body 12. As a result, as the TSP pins 28 retard wear of the cutters,blades 18, and/orbit body 12. Furthermore, the TSP pins 28 may stand out from the cutters,blades 18, and/orbit body 12, thereby giving higher point loading, before and/or after wear of the cutters,blades 18, and/orbit body 12. In any case, the TSP pins 28 may make the cutters,blades 18, and/orbit body 12 more aggressive, thereby increasing ROP and/or decreasing the specific energy required. - As shown in
FIG. 5 andFIG. 6 , thedrill bit 10 may be manufactured using aprepared mold 50. Themold 50 preferably has abit body cavity 52 and may have one ormore blade cavities 54. Themold 50 may also have a plurality ofcutter cavities 56 extending from theblade cavities 54 and/orbit body cavity 52, in cases where the cutters are to be integrally formed with thebit body 12 and/orblades 18. In cases where the cutters are to be formed separately, themold 50 may only include one ormore cutter cavities 56. In cases where theblades 18 are to be formed separately, themold 50 may include a plurality ofcutter cavities 56 extending from one ormore blade cavities 54. Finally, in cases where thepins 28 are to extend beyond the cutters,blades 18, and/orbit body 12, themold 50 may include one ormore pin cavities 58. - Once the
mold 50 is properly prepared, thepins 28 are placed therein. Then, a matrix material, such as a tungsten carbide matrix and/or a diamond grit-impregnated matrix material is packed into themold 50. Finally, a binder material, such as liquefied copper, is allowed to flow into the mold, thereby forming the cutters,blades 18, and/orbit body 12. - It has been discovered that the
blades 18 rarely wear evenly. Therefore, it may be desirable to optimize the design of theblades 18 and the distribution and/or spacing of cutting material along theblades 18, to increase drill bit useful life and minimize the required specific energy while maintaining an acceptable rate of penetration and drilling efficiency. For example, thebit 10 may be designed to have more cutters and/or pins 28 in heavy, or high, wear areas. Thebit 10 may also be designed such that the cutters and/or pins 28 exhibit an optimum bottom hole pattern for increasing ROP in one or more of types of formations. - The
blades 18 of modern drill bits often have three or more sections that serve related and overlapping functions. Specifically, eachblade 18 preferably has a cone section, a nose section, a shoulder section, and a gage section. As discussed above, the cone section of each blade is preferably a substantially linear section extending from near a center-line of thedrill bit 10 outward. Because the cone section is nearest the center-line of thedrill bit 10, the cone section does not experience as much, or as fast, movement relative to the earth formation. Therefore, it has been discovered that the cone section commonly experiences less wear than the other sections. Thus, the cone section can maintain effective and efficient rate of penetration with less cutting material. This can be accomplished in a number of ways. For example, the cone section may have no or fewer cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28, smaller cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28, and/or more spacing between cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28. The cone angle for a PDC bit is typically 15-25°, although, in some embodiments, the cone section is essentially flat, with a substantially 0° cone angle. - The nose represents the lowest point on a drill bit. Therefore, the nose cutter is typically the leading most cutter. The nose section is roughly defined by a nose radius. A larger nose radius provides more area to place cutters in the nose section. The nose section begins where the cone section ends, where the curvature of the blade begins, and extends to the shoulder section. More specifically, the nose section extends where the blade profile substantially matches a circle formed by the nose radius. The nose section experiences much more, and more rapid, relative movement than does the cone section. Additionally, the nose section typically takes more weight than the other sections. As such, the nose section commonly experiences much more wear than does the cone section. Therefore, the nose section preferably has a higher distribution, concentration, or density of cutters, cutting
structures 24,PDC cutting elements 26, and/or TSP pins 28 with respect to the cone section. - The shoulder section begins where the blade profile departs from the nose radius and continues outwardly on each
blade 18 to a point where a slope of the blade is essentially completely vertical, at the gage section. The shoulder section experiences much more, and more rapid, relative movement than does the cone section. Additionally, the shoulder section typically takes the brunt of abuse from dynamic dysfunction, such as bit whirl. As such, the shoulder section experiences much more wear than does the cone section. The shoulder section is also a more significant contributor to rate of penetration and drilling efficiency than the cone section. Therefore, the shoulder section preferably has a higher distribution, concentration, or density of cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28 with respect to the cone section. Depending on application, the nose section or the shoulder section may experience the most wear, and therefore either the nose section or the shoulder section may have the highest distribution, concentration, or density of cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28. - The gage section begins where the shoulder section ends. More specifically, the gage section begins where the slope of the blade is predominantly vertical. The gage section continues outwardly to an outer perimeter or gauge of the
drill bit 10. The gage section experiences the most, and most rapid, relative movement with respect to the earth formation. However, at least partially because of the high, substantially vertical, slope of theblade 18 in the gage section, the gage section does not typically experience as much wear as does the shoulder section and/or the nose section. The gage section does, however, typically experience more wear than the cone section. Therefore, the gage section preferably has a higher distribution of cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28 than the cone section, but may have a lower distribution of cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28 than the shoulder section and/or nose section. - In one embodiment, a highest concentration of the cutters, cutting
structures 24,PDC cutting elements 26, and/or TSP pins 28 occurs near the border between the shoulder section and the gage section. Alternative embodiments may include a highest concentration of the cutters, cuttingstructures 24,PDC cutting elements 26, and/or TSP pins 28, in the shoulder section and/or the gage section. - Upon reading this disclosure, it can be appreciated that the design of a drill bit includes consideration of many factors, such as the size, shape, spacing, orientation, and number of blades; the size, shape, spacing, orientation, and number of cutters, or cutting elements; as well as the materials of the bit body, blades, cutting tables, and substrates. All of these factors may be considered in light of the materials of the earth formation(s) for which the drill bit is designed and/or matched.
- The
bit 10 may employ a plurality ofports 36 over the bit face 16 to enhance fluid velocity of drilling fluid flow and better apportion the flow over the bit face 16 and amongfluid passages 38 betweenblades 18 and extending tojunk slots 22. This enhanced fluid velocity and apportionment helps prevent bit balling in shale formations, for example, which phenomenon is known to significantly retard rate of penetration (ROP). Further, in combination with the enhanced diamond exposure ofbit 10, the improved hydraulics substantially enhances drilling through permeable sandstones. - Other and further embodiments utilizing one or more aspects of the inventions described above can be devised without departing from the spirit of Applicant's invention. For example, the TSP pins 28 may be embedded within the
PDC cutting elements 26 as well. Additionally, or alternatively, the cutters, such as the impregnated cuttingstructures 24 and/orPDC cutting elements 26, with or without the TSP pins 28, may be formed separately from thebit body 12, and later secured thereto, such as by brazing. Similarly, the TSP pins 28 may be secured to, or within, previously formed cutters,blades 18, and/or thebit body 12. Furthermore, one, two, three, or more TSP pins 28 may be embedded within any one or more of the cutters. Of course, the various methods and embodiments of thedrill bit 10 can be included in combination with each other to produce variations of the disclosed methods and embodiments. Reading this disclosure, it can be appreciated that there are a number of ways to impact concentrations or distributions of cutter and/or pin volume, such as by using differently sized, shaped, and/or spaced cutters and/or pins. Discussion of singular elements can include plural elements and vice-versa. - The order of steps can occur in a variety of sequences unless otherwise specifically limited. The various steps described herein can be combined with other steps, interlineated with the stated steps, and/or split into multiple steps. Similarly, elements have been described functionally and can be embodied as separate components or can be combined into components having multiple functions.
- The inventions have been described in the context of preferred and other embodiments and not every embodiment of the invention has been described. Obvious modifications and alterations to the described embodiments are available to those of ordinary skill in the art. The disclosed and undisclosed embodiments are not intended to limit or restrict the scope or applicability of the invention conceived of by the Applicants, but rather, in conformity with the patent laws, Applicants intend to fully protect all such modifications and improvements that come within the scope or range of equivalent of the following claims.
Claims (25)
1. A method of manufacturing a drill bit having a diamond impregnated bit body and a plurality of cutters, such as for drilling into an earth formation, the method comprising the steps of:
preparing a mold having at least one cutter cavity for the cutters;
placing at least one diamond pin in the cutter cavity; and
forming the cutter around the pin, such that the pin is embedded within the cutter.
2. The method as set forth in claim 1 , wherein the mold includes a body cavity for a bit body, a plurality of blade cavities for a plurality of blades extending beyond the bit body, and a plurality of cutter cavities for a plurality of cutters extending beyond the blades.
3. The method as set forth in claim 2 , wherein the placing step includes placing a pin in each cutter cavity.
4. The method as set forth in claim 2 , wherein at least some of the blade cavities have a cone section, a nose section, a shoulder section, and a gage section and wherein the placing step includes placing a pin in at least one cutter cavity in the cone section.
5. The method as set forth in claim 2 , wherein at least some of the blade cavities have a cone section, a nose section, a shoulder section, and a gage section and wherein the placing step includes placing a pin in at least one cutter cavity in the nose section.
6. The method as set forth in claim 2 , wherein at least some of the blade cavities have a cone section, a nose section, a shoulder section, and a gage section and wherein the placing step includes placing a pin in at least one cutter cavity in the shoulder section.
7. The method as set forth in claim 2 , wherein at least some of the cutter cavities include pin cavities, and wherein the placing step includes placing a pin in the pin cavity such that the pin extends beyond the cutter.
8. The method as set forth in claim 2 , further including the step of selecting a pin long enough to extend through the cutter cavity and into the blade cavity.
9. The method as set forth in claim 1 , further including the step of selecting a pin long enough to extend through the cutter cavity and into a bit body cavity.
10. The method as set forth in claim 1 , further including the step of designing the mold to provide more pins in high wear areas of the bit.
11. The method as set forth in claim 1 , further including the step of designing the mold to provide an optimum pattern of pins for a type of formation.
12. A drill bit, such as for drilling into an earth formation, the drill bit comprising:
a bit body;
a plurality of cutters; and
at least one diamond pin embedded within at least one of the cutters, wherein the pin extends both above and below the cutter.
13. The drill bit as set forth in claim 12 , wherein each cutter includes an embedded pin.
14. The drill bit as set forth in claim 12 , wherein the bit body includes a cone section, a nose section, a shoulder section, and a gage section, and wherein the pin is located in the cone section.
15. The drill bit as set forth in claim 12 , wherein the bit body includes a cone section, a nose section, a shoulder section, and a gage section, and wherein the pin is located in the nose section, and wherein there are no pins in the cone section.
16. The drill bit as set forth in claim 12 , wherein the bit body includes a cone section, a nose section, a shoulder section, and a gage section, and wherein the pin is located in the shoulder section, and wherein there are no pins in the cone section.
17. The drill bit as set forth in claim 12 , wherein the bit body includes a plurality of blades, at least one of the blades having a cone section, a nose section, a shoulder section, and a gage section, and wherein at least one cutter in the cone section includes the pin.
18. The drill bit as set forth in claim 12 , wherein the bit body includes a plurality of blades, at least one of the blades having a cone section, a nose section, a shoulder section, and a gage section, and wherein at least one cutter in the nose section includes the pin, and wherein there are no pins in the cone section.
19. The drill bit as set forth in claim 12 , wherein the bit body includes a plurality of blades, at least one of the blades having a cone section, a nose section, a shoulder section, and a gage section, and wherein at least one cutter in the shoulder section includes the pin, and wherein there are no pins in the cone section.
20. The drill bit as set forth in claim 12 , wherein the pin extends beyond the cutter.
21. (canceled)
22. The drill bit as set forth in claim 12 , wherein there are more pins in high wear areas of the bit.
23. The drill bit as set forth in claim 12 , wherein the pins form an optimum pattern for a type of formation.
24. A drill bit, such as for drilling into an earth formation, the drill bit comprising:
a diamond impregnated bit body having a plurality of blades, at least one of the blades having a cone section, a nose section, a shoulder section, and a gage section;
a plurality of diamond impregnated cutters extending from the blades; and
a thermally stable polycrystalline diamond pin embedded within at least some of the cutters in the shoulder section, wherein the pins extend through the cutters and blades in the shoulder section, and wherein there are no pins in the cone section.
25. The drill bit as set forth in claim 12 , wherein the pins extend through the cutters and into the bit body.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/355,258 US20100181116A1 (en) | 2009-01-16 | 2009-01-16 | Impregnated drill bit with diamond pins |
PCT/US2010/020968 WO2010083266A2 (en) | 2009-01-16 | 2010-01-14 | Impregnated drill bit with diamond pins |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/355,258 US20100181116A1 (en) | 2009-01-16 | 2009-01-16 | Impregnated drill bit with diamond pins |
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US20100181116A1 true US20100181116A1 (en) | 2010-07-22 |
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US12/355,258 Abandoned US20100181116A1 (en) | 2009-01-16 | 2009-01-16 | Impregnated drill bit with diamond pins |
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EP3363988A1 (en) | 2017-01-13 | 2018-08-22 | Baker Hughes, A Ge Company, Llc | Impregnated drill bit including a planar blade profile along drill bit face |
CN108868625A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined cut diamond bit |
US10543528B2 (en) | 2012-01-31 | 2020-01-28 | Esco Group Llc | Wear resistant material and system and method of creating a wear resistant material |
US10570669B2 (en) | 2017-01-13 | 2020-02-25 | Baker Hughes, A Ge Company, Llc | Earth-boring tools having impregnated cutting structures and methods of forming and using the same |
US10605009B2 (en) | 2017-11-16 | 2020-03-31 | Baker Hughes, A Ge Company, Llc | Impregnated cutting structures, earth-boring tools including the impregnated cutting structures, and related methods |
US11215012B2 (en) * | 2014-03-11 | 2022-01-04 | Schlumberger Technology Corporation | Cutting elements having non-planar surfaces and downhole cutting tools using such cutting elements |
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CA1333282C (en) * | 1989-02-21 | 1994-11-29 | J. Ford Brett | Imbalance compensated drill bit |
US6394202B2 (en) * | 1999-06-30 | 2002-05-28 | Smith International, Inc. | Drill bit having diamond impregnated inserts primary cutting structure |
US6474425B1 (en) * | 2000-07-19 | 2002-11-05 | Smith International, Inc. | Asymmetric diamond impregnated drill bit |
-
2009
- 2009-01-16 US US12/355,258 patent/US20100181116A1/en not_active Abandoned
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2010
- 2010-01-14 WO PCT/US2010/020968 patent/WO2010083266A2/en active Application Filing
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Cited By (9)
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US9561562B2 (en) | 2011-04-06 | 2017-02-07 | Esco Corporation | Hardfaced wearpart using brazing and associated method and assembly for manufacturing |
US10730104B2 (en) | 2011-04-06 | 2020-08-04 | Esco Group Llc | Hardfaced wear part using brazing and associated method and assembly for manufacturing |
US10543528B2 (en) | 2012-01-31 | 2020-01-28 | Esco Group Llc | Wear resistant material and system and method of creating a wear resistant material |
US11215012B2 (en) * | 2014-03-11 | 2022-01-04 | Schlumberger Technology Corporation | Cutting elements having non-planar surfaces and downhole cutting tools using such cutting elements |
EP3363988A1 (en) | 2017-01-13 | 2018-08-22 | Baker Hughes, A Ge Company, Llc | Impregnated drill bit including a planar blade profile along drill bit face |
US10494875B2 (en) | 2017-01-13 | 2019-12-03 | Baker Hughes, A Ge Company, Llc | Impregnated drill bit including a planar blade profile along drill bit face |
US10570669B2 (en) | 2017-01-13 | 2020-02-25 | Baker Hughes, A Ge Company, Llc | Earth-boring tools having impregnated cutting structures and methods of forming and using the same |
CN108868625A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined cut diamond bit |
US10605009B2 (en) | 2017-11-16 | 2020-03-31 | Baker Hughes, A Ge Company, Llc | Impregnated cutting structures, earth-boring tools including the impregnated cutting structures, and related methods |
Also Published As
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WO2010083266A2 (en) | 2010-07-22 |
WO2010083266A3 (en) | 2010-10-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BAKER HUGHES INCORPORATED, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STAUFFER, BRIAN;REEL/FRAME:022345/0432 Effective date: 20090115 |
|
AS | Assignment |
Owner name: BAKER HUGHES INCORPORATED, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STAUFFER, BRUCE;REEL/FRAME:022504/0466 Effective date: 20090115 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |